(19)
(11) EP 0 860 931 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
15.03.2000 Bulletin 2000/11

(43) Date of publication A2:
26.08.1998 Bulletin 1998/35

(21) Application number: 98301226.1

(22) Date of filing: 19.02.1998
(51) International Patent Classification (IPC)7: H02K 7/08, H02K 5/173, G11B 19/20
(84) Designated Contracting States:
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 24.02.1997 JP 5564197

(71) Applicant: Minebea Kabushiki Kaisha
Kitasaku-gun, Nagano-ken (JP)

(72) Inventor:
  • Obara, Rikuro, c/o Minebea Kabushiki Kaisha
    Kitasaku-gun, Nagano-ken (JP)

(74) Representative: Murgatroyd, Susan Elizabeth et al
Baron & Warren 18 South End Kensington
London W8 5BU
London W8 5BU (GB)

   


(54) A rotary machine of inner rotor type


(57) A rotary machine of inner rotor type includes a double row bearing apparatus 2 comprising a stepped shaft 10 having a larger diameter shaft portion 10a around which an inner rolling contact recess 11a is formed and a reduced diameter shaft portion 10b, a short cylindrical outer race 12 on the interior surface of which an outer rolling contact recess 11b is formed, balls 13 interposed between the inner and outer recesses, and a ball bearing 17 comprising an inner race 14 to be fitted over the reduced diameter shaft portion 10b, an outer race 15, and balls 16 to be interposed between rolling contact recesses formed on the opposite surfaces of the races 14,15. A housing 1 comprises a cylindrical central housing 5 having a stator 4 mounted on the inner side thereof, a lid part 6 having a cylindrical central boss 8, and a bottom part 7 having a cylindrical central boss 9. The outer races 12,15 are fitted into the respective bosses 8,9, a top end of the larger diameter shaft portion 10a extends through the central boss 8 to protrude out the housing 1, and a rotor 3 is fixedly secured to the larger diameter shaft portion 10a.






Search report